Why is the size of sodium ion less than that of potassium ion?

Give the principle of preparation of sodium hydroxide by Solvay's process.

Note: Solvay's process is used to prepare sodium carbonate only not sodium hydroxide.

What are the products of electrolysis when an aqueous solution of sodium chloride is electrolysed?

What happens when $\mathrm{NaOH}$ is added to ${\mathrm{Al}}_2{\left({\mathrm{SO}}_4\right)}_3$ solution drop by drop and finally in excess. Give balanced equations only.

In the extraction of sodium by electrolytic method, fused sodium chloride is used instead of aqueous solution of sodium chloride. What is the reason?

What happens when sodium bromide is heated with hot conc. ${\mathrm{H}}_2{\mathrm{SO}}_4$?